JPS63156108A - Construction of marine structure and mold serving as timbering - Google Patents

Abstract

PURPOSE:To improve the workability, shorten the term of construction, save labors and improve the safety of work, by unifying molds and timberings for supporting the molds integrally, and by sinking a timbering mold unit in water to be carried. CONSTITUTION:When a marine structure with girders 71, 72 betwee the head sections of a pile unit 4 group projected from the level of water is constructed, then the folding system timbering-mold unit 1 of molds 3 integrated with timberings 2 is manufactured, and a floating raft 5 is connected to the timbering mold unit 1 and they are sunken in water and are conducted between pile units 4. Then, the timbering mold unit 1 is lifted up and is spanned across the head sections of the pile units on both sides, to set up slab mold surface 31, and folded girder molds 35, 36 are extended to set up girder mold surfaces. After that concrete is case in the timbering mold unit 1, and after the concrete is hardened, molds are removed from the timbering mold unit 1, and the unit 1 with the removed molds is sunken in water and is moved, and the work in executed in order.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a construction technique for constructing a concrete floating structure on the head of a pile protruding above the water.

<Prior Art> When constructing a floating structure such as a marine platform or a pier at the head of a group of piles protruding from the water, shoring is required in addition to formwork to support the formwork.

Since the surface above the water does not serve as a direct support surface, the work boat is positioned directly below the construction site, and the support equipment installed on the work boat is then used to assemble the shoring and formwork to form the pile. A construction method is generally known in which a floating structure is constructed at a position higher than the head of the pile, and then the constructed floating structure is lowered and installed on the head of the pile body.

Problems to be Solved by the Present Invention> The conventional construction techniques described above have the following problems.

(b) In addition to requiring a great deal of time and effort to assemble and remove formwork, such offshore work is extremely dangerous as workers may fall.

(b) Construction efficiency is extremely low because it takes time to assemble, dismantle, and move formwork and shoring during offshore work.

(c) Because the work is carried out at low tides and calm waves, it is greatly affected by weather conditions and the work time is limited to a short time.

OBJECT OF THE INVENTION The present invention has been made in view of the above points, and provides a floating structure that has excellent workability, shortens the construction period and labor, and further improves work safety. The purpose is to provide construction technology.

Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, a case will be described in which a concrete floating structure having fingers in the vertical and horizontal directions is constructed on the floor.

Kui〉Production of a formwork that also serves as a support In the present invention, a formwork that also serves as a support 1 integrates a support and a formwork.
use.

An example of the supporting formwork 1 is shown in Fig. 1.2.

This formwork 1 that also serves as a support is made up of a support 2 and a formwork 3, and is manufactured integrally on land.

[Shoring 1 Shoring 2 is formed into a ladder shape by fixing a plurality of cross members 22 between vertical members 21 made of steel pipes etc. arranged in parallel, and according to each molding surface of formwork 3 described later. A truss support 23 is provided and formed. (See FIG. 3) A plurality of sets of formwork 3 having a hat-shaped molding surface are placed on this support 2 to produce a formwork 1 that also serves as a support. The number of formworks 3 to be placed is determined as appropriate.

[Formwork 1 (Figure 2) The formwork 3 is broadly divided into a slab formwork and a girder formwork, but in detail it has the following six types of molding surfaces.

(a) Slab forming surface 31 This forming surface 31 is a fixed forming surface for forming the slab surface of a concrete structure.

(b) A pair of forming surfaces 32 and 32 for the side beams are fixed forming surfaces disposed at both ends of the slab forming surfaces 310 in a direction intersecting with the vertical members 21 of the shoring 2.

(C) A pair of cross-beam floor forming surfaces 33. 33 A plane horizontally arranged at the lower end of the cross-beam side surface forming surface 32, which forms the floor surface of the cross-beam to be constructed between the pile bodies. Fixed molding surface for

(d) A pair of longitudinal girder side forming surfaces 34. 34 are fixed surfaces arranged parallel to the longitudinal members 21 of the shoring 2 at both ends of the slab forming surface 31.

(e) Forming surface 35 for stringer floor This is a forming surface for shaping the floor surface of the stringer constructed between the pile bodies.

(f) A pair of pile forming surfaces 36 These are planes that form the floor surface at the intersection of the vertical and horizontal girders supported by the pile bodies, and the forming surfaces have U-shaped openings large enough to accommodate the pile bodies. has been established.

Of the above six types of molded surfaces, for two types, the stringer floor molded surface 35 and the pile-around molded surface 36, one end of the truss support 23 that is integrally connected to the back surface of each molded surface 35. It is rotatably connected to the shoring 2 and configured in a foldable manner.

Further, in this embodiment, a case will be described in which the stringer floor forming surface 35 and the pile surrounding forming surface 36 are provided in an example of the supporting formwork 1, but they may be provided on both sides thereof.

Fill the cleats.

A hanging bracket or the like is provided at the head of each pile body 4 to support the supporting formwork 1.

Kuha〉Submerged transportation of support formwork (Fig. 1.3) On the other hand, a float raft 5, which is a buoyant structure, is connected to the top surface of the support formwork 1 manufactured on land and submerged at the site. Transport between 4 pile bodies.

Forming surface 35 for the longitudinal girder floor forming a part of the support formwork 1
The pile forming surface 36 is transported while being suspended from the shoring 2.

2> Suspension of pile bodies from the formwork that also serves as a support (Fig. 4) After the formwork 1 that also serves as a support is transported between each pile body 4 and arranged in parallel, the float raft 5 is removed from each formwork that also serves as a support 1.

When removing the float raft 5, the front and rear of the shoring 2 constituting the formwork 1 also used for shoring are rearranged by connecting a crane and a lever block.

Next, the supporting formwork 1 is lifted to a predetermined height using a crane and a lever block, and then fixed to the head of the pile body 4 using hanging materials 6.

In this way, the supporting formwork 1 is spanned between the heads of each pile body 4 via the hanging members 6.

At this point, the setting of the slab formwork is completed.

Assembling the formwork (Fig. 4.5) After starting the stringer floor forming surface 35 and the pile surrounding forming surface 36 hanging from the shoring 2 to the horizontal position, each forming surface 35. The free end of 36 is rotatably connected to the supporting structure 2 constituting the adjacent supporting formwork 1.

Raising each molding surface 35,36 to a horizontal position can be facilitated, for example, by lifting a rope member connected to the free end of each molding surface 35,36.

Further, the gap formed between the pile forming surface 36 and the pile body 4 is closed using an auxiliary formwork.

Note that the outermost part of the formwork 3 consisting of a group of a plurality of supporting formworks is surrounded by a known formwork.

At this point, the setting of the formwork for the girder is completed.

Concrete pouring (Fig. 6.7 °) After assembling reinforcing bars, concrete is poured on the top of each supporting formwork 1 to form a concrete floating structure having longitudinal girders 71 and transverse girders 72. Build object 7.

The weight of the floating structure 7 is supported by the pile body 4 via the hanging material 6.

Kuto> Demoulding After a predetermined curing period has elapsed, the formwork 3 is demolded.

To demold the formwork 3, the steps for constructing the floating structure 7 are generally reversed, but in detail, the steps are performed in the following order.

(a) The molded surface 35 for the stringer floor and the molded surface 36 for the pile surroundings of the movable structure are used by removing the bottles that are pivoted to their free ends and using the dead weight of the molded surfaces 35 and 36 and the truss support 41. Remove from the mold.

(b) The other molding surfaces 31 to 34 are removed from the mold using the weight of the supporting formwork 1.

<H> Movement of the supporting formwork (Fig. 3) The supporting formwork 1, which has been removed from the hanging material 6 and demolded, is gently lowered into the water using a separate lifting device.

*〒 Then, the float raft 5 is drawn onto the upper surface of the formwork l that also serves as a support, and the lifting device is replaced with the float raft 5.

Therefore, the weight of the supporting form l is supported by the buoyancy of the float raft 5.

The supporting formwork 1 suspended underwater is moved forward.

The above steps are repeated to sequentially construct the floating structure 7 in units of predetermined blocks.

Other Examples> It is also conceivable that the shoring 2 and the formwork 3 constituting the shoring/formwork 1 be configured to be expandable and retractable in the longitudinal girder 71 direction and the transverse girder 72 direction. (Not shown) That is, each vertical member 21 and cross member 22 of the shoring 2 are configured to be expandable and retractable by interposing jacks on their way.

Regarding the formwork 3, some of the forming surfaces 31 to 35 constituting the formwork 3 are divided into two parts.
A part of the molding surfaces 31 to 31 can be made removable, or
A part of 35 is pivotally supported and configured to open and close.

According to the present embodiment, there is an advantage that the mold 3 can be easily contracted, so that demolding can be easily performed.

Effects of the Present Invention> Since the present invention is as explained above, the following effects can be obtained.

(b) By integrating the formwork with a completely completed molding surface and the shoring that supports this formwork, the assembly and disassembly work of the formwork and shoring can be done at the same time, improving construction efficiency. is significantly improved.

(b) The number of tasks performed by workers on the water will be reduced, improving work safety.

(c) A method in which the formwork that also serves as a support is transported submerged in water.As a result, its center of gravity is lower than when the formwork that also serves as a support is transported by floating on the water.

Therefore, steel formwork can be used as the formwork, which not only improves the stability of the formwork that also serves as support during transportation, but also improves the finishing accuracy of floating structures and reduces the number of times the formwork is reused. The advantage is that it increases.

[Brief explanation of the drawing]

Figure 1: An explanatory diagram of an embodiment of the present invention Figure 2: A perspective view of the formwork that also serves as a support Figure 3: An explanatory diagram of the formwork that also serves as a support during transportation and movement Figure 4: Pile body of the formwork that also serves as a support Figure 5: Explanatory diagram of the formwork assembly Figure 6: Explanatory diagram of concrete pouring Figure 7: Cross-sectional view of ■-■ in Figure 6 Agent: Patent Attorney Sashi Yamaguchi Insect 1. :, t=!・－・、
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Claims (2)

[Claims] (1) When constructing a floating structure with girders extending vertically and horizontally between the heads of pile groups protruding from the water, a foldable formwork that combines the formwork and shoring is manufactured, and the above-mentioned The formwork that also serves as support is submerged in water and guided between the pile bodies.The formwork that also serves as support is then hoisted to a specified height and stretched over the heads of the pile bodies on both sides to set the slab formwork surface. Raise the girder formwork that has been folded up to set the girder formwork surface, then pour concrete into the support formwork, and after the concrete hardens, remove the support formwork and remove the removed support formwork. A method for constructing floating structures, which is characterized by submerging dual-purpose formwork in water and moving it between pile bodies to be constructed in sequence. (2) A dual-use support type consisting of a ladder-shaped support, a formwork for the slab surface that is integrally fixed to the support, and a formwork for the girder that is rotatably connected at one end to the support. frame.